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Commitments and Contingencies - Additional Information (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
loan
tranche
lease
Jul. 01, 2022
USD ($)
Sep. 30, 2023
USD ($)
loan
tranche
lease
Sep. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
loan
tranche
lease
repurchase_request
Sep. 30, 2022
USD ($)
repurchase_request
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2018
partnership
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Loss Contingencies [Line Items]                          
Lessee, number of leases | lease 10   10     10              
Present value of remaining lease payments $ 17,535,000   $ 17,535,000     $ 17,535,000              
Operating lease expense           $ 4,000,000 $ 4,000,000            
Lessee, number of office leases | lease 1   1     1              
Operating lease liabilities $ 15,630,000   $ 15,630,000     $ 15,630,000         $ 18,563,000    
Operating lease liability, statement of financial position [Extensible List] Accounts Payable and Accrued Liabilities   Accounts Payable and Accrued Liabilities     Accounts Payable and Accrued Liabilities              
Operating lease right-of-use assets $ 13,367,000   $ 13,367,000     $ 13,367,000         16,177,000    
Operating lease right-of-use asset, statement of financial position [Extensible List] Other assets   Other assets     Other assets              
Weighted average remaining lease term 4 years   4 years     4 years              
Discount rate (as a percent) 5.20%   5.20%     5.20%              
Derivative liabilities [1] $ 8,781,000   $ 8,781,000     $ 8,781,000         16,855,000    
Gain (loss) on market valuation adjustments     16,318,000 $ (50,893,000)   1,275,000 (183,487,000)            
Number of partnerships, committed to fund | partnership                 2        
Guarantee obligations 5,913,000   5,913,000     5,913,000         6,344,000    
Guarantee obligations, credit reserve 5,000,000   5,000,000     5,000,000              
Special purpose entities assets 28,000,000   28,000,000     28,000,000         30,000,000    
Special purpose entities liabilities 6,000,000   6,000,000     6,000,000         6,000,000    
Residential repurchase reserve 4,611,000   4,611,000     4,611,000         7,051,000    
Residential loans repurchase (reversal) provision           1,000,000 $ 4,000,000            
Aggregate amount of loss contingency reserves 2,000,000   2,000,000     2,000,000              
Riverbend Funding, LLC                          
Loss Contingencies [Line Items]                          
Earnout period   2 years                      
Potential future payments on loans   $ 25,300,000                      
Contingent liability 0   0     0              
Maximum                          
Loss Contingencies [Line Items]                          
Loss from arrangements           100,000              
Residential Loans                          
Loss Contingencies [Line Items]                          
Unpaid principal balance 658,540,000   658,540,000     658,540,000         822,063,000    
Fair value of loans $ 610,946,000   $ 610,946,000     $ 610,946,000         $ 780,781,000    
Number of loans in foreclosure | loan 0   0     0         0    
Business Purpose Loans                          
Loss Contingencies [Line Items]                          
Residential repurchase reserve $ 0   $ 0     $ 0         $ 1,000,000    
Number of residential repurchase requests (in repurchase requests) | repurchase_request           6 0            
Number of loans repurchased | loan           12 0            
Repurchase request outstanding 0   0     $ 0              
Other income                          
Loss Contingencies [Line Items]                          
Other income related to risk sharing agreement     200,000     500,000              
Guarantee Obligations                          
Loss Contingencies [Line Items]                          
Potential future payments on loans 44,000,000   44,000,000     44,000,000              
Original unpaid balance of loans subject to risk sharing agreements                       $ 3,190,000,000 $ 3,190,000,000
Unpaid principal balance $ 406,000,000   $ 406,000,000     $ 406,000,000              
Weighted average original FICO score 761   761     761              
Weighted average original loan-to-value (LTV) 74.00%   74.00%     74.00%              
Guarantee Obligations | Residential Loans                          
Loss Contingencies [Line Items]                          
Number of loans in foreclosure | tranche 3   3     3              
Unpaid principal balance of loans in foreclosure $ 1,000,000   $ 1,000,000     $ 1,000,000              
Guarantee Obligations | Financing Receivables, Equal to Greater than 90 Days Past Due                          
Loss Contingencies [Line Items]                          
Fair value of loans 7,000,000   7,000,000     7,000,000              
Repurchase Reserves                          
Loss Contingencies [Line Items]                          
Residential repurchase reserve 5,000,000   5,000,000     $ 5,000,000         $ 6,000,000    
Number of residential repurchase requests (in repurchase requests) | repurchase_request           1 7            
Number of loans repurchased | loan           5 1            
BPL Bridge Loans                          
Loss Contingencies [Line Items]                          
Committed contribution                   $ 50,000,000      
Capital contribution 1,000,000                        
Commitment To Fund Residential Bridge Loan                          
Loss Contingencies [Line Items]                          
Other commitments made 623,000,000   623,000,000     $ 623,000,000              
Derivative liabilities 1,000,000   1,000,000     1,000,000              
Gain (loss) on market valuation adjustments     (400,000)     300,000              
Commitment To Fund Strategic Investment                          
Loss Contingencies [Line Items]                          
Other commitments made 15,000,000   15,000,000     15,000,000              
Payments for other commitments         $ 25,000,000                
Commitment To Fund RWT Horizons Investments                          
Loss Contingencies [Line Items]                          
Other commitments made $ 2,000,000   $ 2,000,000     $ 2,000,000              
Payments for other commitments               $ 5,000,000          
[1] Our consolidated balance sheets include assets of consolidated variable interest entities (“VIEs”) that can only be used to settle obligations of these VIEs and liabilities of consolidated VIEs for which creditors do not have recourse to Redwood Trust, Inc. or its affiliates. At September 30, 2023 and December 31, 2022, assets of consolidated VIEs totaled $9,639,117 and $9,257,291, respectively. At September 30, 2023 and December 31, 2022, liabilities of consolidated VIEs totaled $8,635,696 and $8,270,276, respectively. See Note 4 for further discussion.